MEV: Maximal Extractable Value

# MEV: Maximal Extractable Value

MEV is the profit that can be extracted from a blockchain by reordering, inserting, or censoring transactions within a block. Originally called "Miner Extractable Value," the name changed to "Maximal" after Ethereum moved to proof-of-stake — but the mechanism is the same.

## Where MEV Comes From

Every pending transaction sits in the mempool, visible to anyone. Validators and specialized bots scan this pool constantly for profitable orderings. Three main strategies dominate:

**Arbitrage**: A DEX price drifts from fair value due to a large trade. A bot spots the discrepancy and inserts its own trade before the original executes, capturing the price difference.

**Sandwich Attacks**: A bot detects a large pending swap, places a buy order before it (front-run) and a sell order after it (back-run), squeezing the victim's trade between two of its own.

**Liquidations**: Lending protocols liquidate undercollateralized positions. Bots race to be the first to trigger a liquidation and claim the bonus.

## Flashbots and the MEV Supply Chain

Flashbots built MEV-Boost, now used by over 90% of Ethereum validators. The system creates an auction where block builders compete to assemble the most profitable block, and validators simply select the highest bid. This redistributes MEV extraction but concentrates block-building power among a few specialized builders.

## Why It Matters for Users

MEV is effectively a tax on ordinary DeFi users. Every large swap on Uniswap, every liquidation on Aave is a potential MEV opportunity. Mitigation strategies include slippage protection, private RPC endpoints (like Flashbots Protect), and intent-based architectures like CoW Protocol.

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